问题：

[单选]

A Windows Communication Foundation (WCF) service implements a contract with one-way and request-reply operations.The service is exposed over a TCP transport. Clients use a router to communicate with the service. The router is implemented as follows. (Line numbers are included for reference only.)
01 ServiceHost host = new ServiceHost(typeof(RoutingService));
02 host.AddServiceEndpoint(
03 typeof(ISimplexDatagramRouter),
04 new NetTcpBinding(), "net.tcp://localhost/Router"
05 );
06 List lep = new List();
07 lep.Add(
08 new ServiceEndpoint(
09 ContractDescription.GetContract(
10 typeof(ISimplexDatagramRouter)
11 ),
12 new NetTcpBinding(),
13 new EndpointAddress("net.tcp://localhost:8080/Logger")
14 )
15 );
16 RoutingConfiguration rc = new RoutingConfiguration();
17 rc.FilterTable.Add(new MatchAllMessageFilter(), lep);
18 host.Description.Behaviors.Add(new RoutingBehavior(rc));Request-reply operations are failing.
You need to ensure that the router can handle one-way and request-reply operations.What should you do?（）
 

A . Change line 03 as follows: typeof(IRequestReplyRouter),
B . Change line 03 as follows: typeof(IDuplexSessionRouter),
C . Change line 10 as follows: typeof(IRequestReplyRouter)
D . Change line 10 as follows: typeof(IDuplexSessionRouter)